projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 73228c7e PA |
1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* | |
| 3 | * | |
| 4 | * Copyright (c) 2014 Samsung Electronics Co., Ltd. | |
| 5 | * Author: Andrey Ryabinin <a.ryabinin@samsung.com> | |
| 6 | */ | |
| 7 | ||
| 8 | #define pr_fmt(fmt) "kasan test: %s " fmt, __func__ | |
| 9 | ||
| 10 | #include <linux/mman.h> | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/printk.h> | |
| 13 | #include <linux/slab.h> | |
| 14 | #include <linux/uaccess.h> | |
| 15 | ||
| f7e01ab8 | 16 | #include "kasan.h" |
| 73228c7e | 17 | |
| 73228c7e PA |
18 | static noinline void __init copy_user_test(void) |
| 19 | { | |
| 20 | char *kmem; | |
| 21 | char __user *usermem; | |
| 756e5a47 | 22 | size_t size = 128 - KASAN_GRANULE_SIZE; |
| e1566567 | 23 | int __maybe_unused unused; |
| 73228c7e PA |
24 | |
| 25 | kmem = kmalloc(size, GFP_KERNEL); | |
| 26 | if (!kmem) | |
| 27 | return; | |
| 28 | ||
| 29 | usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE, | |
| 30 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
| 31 | MAP_ANONYMOUS | MAP_PRIVATE, 0); | |
| 32 | if (IS_ERR(usermem)) { | |
| 33 | pr_err("Failed to allocate user memory\n"); | |
| 34 | kfree(kmem); | |
| 35 | return; | |
| 36 | } | |
| 37 | ||
| d73dad4e KC |
38 | OPTIMIZER_HIDE_VAR(size); |
| 39 | ||
| 73228c7e | 40 | pr_info("out-of-bounds in copy_from_user()\n"); |
| 756e5a47 | 41 | unused = copy_from_user(kmem, usermem, size + 1); |
| 73228c7e PA |
42 | |
| 43 | pr_info("out-of-bounds in copy_to_user()\n"); | |
| 756e5a47 | 44 | unused = copy_to_user(usermem, kmem, size + 1); |
| 73228c7e PA |
45 | |
| 46 | pr_info("out-of-bounds in __copy_from_user()\n"); | |
| 756e5a47 | 47 | unused = __copy_from_user(kmem, usermem, size + 1); |
| 73228c7e PA |
48 | |
| 49 | pr_info("out-of-bounds in __copy_to_user()\n"); | |
| 756e5a47 | 50 | unused = __copy_to_user(usermem, kmem, size + 1); |
| 73228c7e PA |
51 | |
| 52 | pr_info("out-of-bounds in __copy_from_user_inatomic()\n"); | |
| 756e5a47 | 53 | unused = __copy_from_user_inatomic(kmem, usermem, size + 1); |
| 73228c7e PA |
54 | |
| 55 | pr_info("out-of-bounds in __copy_to_user_inatomic()\n"); | |
| 756e5a47 | 56 | unused = __copy_to_user_inatomic(usermem, kmem, size + 1); |
| 73228c7e PA |
57 | |
| 58 | pr_info("out-of-bounds in strncpy_from_user()\n"); | |
| 756e5a47 | 59 | unused = strncpy_from_user(kmem, usermem, size + 1); |
| 73228c7e PA |
60 | |
| 61 | vm_munmap((unsigned long)usermem, PAGE_SIZE); | |
| 62 | kfree(kmem); | |
| 63 | } | |
| 64 | ||
| 73228c7e PA |
65 | static int __init test_kasan_module_init(void) |
| 66 | { | |
| 67 | /* | |
| 0fd37925 AK |
68 | * Temporarily enable multi-shot mode. Otherwise, KASAN would only |
| 69 | * report the first detected bug and panic the kernel if panic_on_warn | |
| 70 | * is enabled. | |
| 73228c7e PA |
71 | */ |
| 72 | bool multishot = kasan_save_enable_multi_shot(); | |
| 73 | ||
| 74 | copy_user_test(); | |
| 73228c7e PA |
75 | |
| 76 | kasan_restore_multi_shot(multishot); | |
| 77 | return -EAGAIN; | |
| 78 | } | |
| 79 | ||
| 80 | module_init(test_kasan_module_init); | |
| 81 | MODULE_LICENSE("GPL"); |